JPH0270056A - Production of nitrided parts - Google Patents
Production of nitrided partsInfo
- Publication number
- JPH0270056A JPH0270056A JP18727488A JP18727488A JPH0270056A JP H0270056 A JPH0270056 A JP H0270056A JP 18727488 A JP18727488 A JP 18727488A JP 18727488 A JP18727488 A JP 18727488A JP H0270056 A JPH0270056 A JP H0270056A
- Authority
- JP
- Japan
- Prior art keywords
- comparative example
- nitriding
- parts
- less
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 238000005121 nitriding Methods 0.000 claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 4
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 4
- 229910052718 tin Inorganic materials 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 229910052782 aluminium Inorganic materials 0.000 claims abstract 3
- 229910052802 copper Inorganic materials 0.000 claims abstract 3
- 229910052759 nickel Inorganic materials 0.000 claims abstract 3
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract 3
- 229910052717 sulfur Inorganic materials 0.000 claims abstract 3
- 238000000034 method Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract 2
- 229910052720 vanadium Inorganic materials 0.000 abstract 2
- 229910052742 iron Inorganic materials 0.000 abstract 1
- 229910052750 molybdenum Inorganic materials 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 24
- 238000009826 distribution Methods 0.000 description 3
- 238000009863 impact test Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005501 phase interface Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用骨！！Ｆ）
本発明は、窒化部品の製造方法に関するもので、窒化処
理時間の短縮と窒化後の高い靭性を有する製造方法に関
する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Use!!F) The present invention relates to a method for manufacturing nitrided parts, and relates to a manufacturing method that shortens nitriding time and provides high toughness after nitriding.
（従来の技術）
機械構造用部品の窒化処理を短時間で行うために各種の
迅速窒化鋼が提唱されている。その中で窒化処理後にＨ
ｖ２０．０以上の芯部硬さが必要な場合には例えば特開
昭６２−７２４３号公報等に開示される■添加型の迅速
窒化鋼が最も有効である。(Prior Art) Various types of rapid nitriding steels have been proposed in order to perform nitriding treatment of mechanical structural parts in a short time. After nitriding treatment, H
When a core hardness of v20.0 or more is required, the most effective is the rapid nitriding steel of the type (3), which is disclosed in, for example, Japanese Unexamined Patent Publication No. 62-7243.
（発明が解決しようとする課題）
しかし、上記の従来技術のものは迅速な窒化処理が可能
であるが、第２図の比較例Ｂ−１が示すように窒化処理
後靭性が低いという問題点がある。(Problems to be Solved by the Invention) However, although the above-mentioned conventional technology allows rapid nitriding, it has the problem of low toughness after nitriding, as shown in Comparative Example B-1 in FIG. There is.
又、Ｔｉ添加によりＴｉＮ、Ｔｉｃを析出しオーステナ
イト粒度の微細化やＭｎ、、Ｂ等の添加により非調質状
態で靭性の高いベイナイト組織にする方法も試みられて
いるが第４図の比較例Ｃ−２に示す様に靭性（例えば衝
撃値）はほとんど改善されないという問題点がある。In addition, attempts have been made to precipitate TiN and Tic by adding Ti to refine the austenite grain size, and to create a bainite structure with high toughness in a non-thermal condition by adding Mn, B, etc., but the comparative example shown in Fig. 4 As shown in C-2, there is a problem in that the toughness (for example, impact value) is hardly improved.
本発明かかる従来技術の問題点を解決するものである。The present invention solves the problems of the prior art.
（課題を解決するための手段及び作用）課題を解決する
ために
（１）次の組成を必須成分として持ち、かつ８００〜９
００℃で加熱後筒、冷することを特徴とする窒化部品の
製造方法とした。(Means and effects for solving the problem) In order to solve the problem: (1) It has the following composition as an essential component, and 800 to 9
This method of manufacturing nitrided parts is characterized by heating the cylinder at 00°C and then cooling it.
Ｃ：０．２０〜０．５０％
Ｓｉ：０．３０％以下
Ｍｎ ： ０． ５０〜１． ５０％
Ｃｒ：１．２０％以下
：０．０５〜０．３０％
ＡＩ：０．０５〜０．３０％
Ｐ Ｓ：それぞれ０．０２％以下
Ｃｕ、Ｎｉ Ｓｎ：それぞれ０．０５％以下残部：Ｆ
ｅとその他年可避な不純物
（２）前記（１）の必須成分に、さらに、Ｍｏ：０．１
０〜０．４０％を含んだ迅速窒化鋼の製造方法とした。C: 0.20-0.50% Si: 0.30% or less Mn: 0. 50-1. 50% Cr: 1.20% or less: 0.05 to 0.30% AI: 0.05 to 0.30% PS: 0.02% or less each Cu, Ni Sn: 0.05% or less each Remainder: F
e and other inevitable impurities (2) In addition to the essential components of (1) above, Mo: 0.1
A method for producing rapid nitriding steel containing 0 to 0.40%.
（実施例）
ここに本発明者が鋭意研究の結果、■添加型迅速窒化鋼
の窒化後の衝撃値を改善するためには、Ｖ４Ｃ，の析出
形態の制御が重要であることを知見した。すなわちオー
ステナイト化後の冷却途中６５０℃前後でオーステナイ
トとフェライトの相界面に析出する■４Ｃ３が衝撃値を
低下させるものであると推定されるので、Ｖ ａ Ｃ３
の相界面析出を阻止するため先に出願した特願昭６２−
１６０４２８号記載の迅速窒化鋼を用いて実施した。(Example) As a result of intensive research, the inventors of the present invention have found that controlling the precipitation form of V4C is important in order to improve the impact value after nitriding of (1) addition type rapid nitriding steel. In other words, it is estimated that ■4C3, which precipitates at the phase interface between austenite and ferrite at around 650°C during cooling after austenitization, reduces the impact value, so V a C3
A patent application previously filed in 1982 to prevent the phase interface precipitation of
The experiment was carried out using the rapid nitriding steel described in No. 160428.
第１表は供試材の化学成分を示すもので、Ｎｏ、 １は
比較ｍＡＴ：ｓｃＭ４４０Ｈ材である。Ｎｏ、 ２ 、
Ｎｏ、 ３はそれぞれ比較鋼Ｂ、Ｃで■添加型迅速窒
化鋼である。Ｎｏ、 ４ 、 Ｎｏ、 ５はそ、れぞれ
実施鋼り、Ｅであり本発明者が発明した特願昭６２−１
６０４２８号記載の■添加型迅速窒化鋼である。Table 1 shows the chemical components of the test materials, and No. 1 is the comparative mAT:scM440H material. No, 2,
Nos. 3 and 3 are comparative steels B and C, respectively, which are ■ additive type rapid nitriding steels. No. 4, No. 5, and No. 5 are the actual steel sheets E, respectively, and are patent applications filed in 1982-1 invented by the present inventor.
This is a rapid nitriding steel with ■ addition type described in No. 60428.
第２表は第１表に示す供試材を前処理を表に示す条件で
行ったもので、窒化条件は５７０℃で４時間ガス軟窒化
後油冷を行ったものである。表中の［表面より０．０５
ｍｍ部の硬さ」はビッカース硬変針で測定した結果であ
り、「硬化深さ」はＨｖ４００以上の硬さを示す部分の
深さである。「芯部硬さ」は中心部の硬さをビッカース
硬度計で測定した結果であり、「シャルピー衝撃値ｊは
２ ｍｍのｖノツチシャルピー試験片に全面に窒化処理
を行い２０℃で試験を行った結果である。図中記号は第
１図〜第４図のグラフ中に用いられる記号を示すもので
ある。In Table 2, the test materials shown in Table 1 were pretreated under the conditions shown in the table, and the nitriding conditions were gas nitrocarburizing at 570° C. for 4 hours followed by oil cooling. In the table [0.05 from the surface
"Hardness in mm section" is the result of measurement with a Vickers hardening needle, and "curing depth" is the depth of the part showing hardness of Hv400 or more. "Core hardness" is the result of measuring the hardness of the center using a Vickers hardness tester, and "Charpy impact value J" is the result of measuring the hardness of the center using a Vickers hardness tester. The symbols in the figure indicate the symbols used in the graphs of FIGS. 1 to 4.
第１図はシャルピー衝撃試験片の硬さ分布を示すグラフ
で、■添加の鋼に窒化した実施例１．実施例２．比較例
Ｂ−１は■が添加してない鋼に窒素した比較例Ａ−１よ
りも硬化深さが深いことを示している。Figure 1 is a graph showing the hardness distribution of Charpy impact test specimens, and shows Example 1. Example 2. Comparative Example B-1 shows that the hardening depth is deeper than Comparative Example A-1, in which nitrogen was added to steel without ■.
第２図は比較例Ｂ−１と実施例゛１．実施例２のシャル
ピー衝撃値の比較グラフであり、実施例１実施例２で示
す本発明のものが高い衝撃値を示している。第３図は比
較例Ａ−１と比較例Ｂ−１のシャルピー衝撃値の比較で
あり、比較例Ａ−１のシャルピー衝撃値は比較例Ｂ−］
よりも高いことを示すが比較例Ａ−１は第１図に示す様
に■が添加されていないため窒化による硬化深が■添加
の鋼より浅くなっている。FIG. 2 shows Comparative Example B-1 and Example 1. It is a comparison graph of the Charpy impact values of Example 2, and the one of the present invention shown in Example 1 and Example 2 shows a high impact value. Figure 3 is a comparison of the Charpy impact values of Comparative Example A-1 and Comparative Example B-1, and the Charpy impact value of Comparative Example A-1 is the same as that of Comparative Example B-]
However, as shown in FIG. 1, Comparative Example A-1 does not contain ``■'', so the hardening depth due to nitriding is shallower than that of the steel with ``■''.
第４図は比較例Ａ−２と比較例Ｂ−２．比較例Ｃ１、比
較例Ｃ−２のシャルピー衝撃値の比較でありＶが添加さ
れていない比較例Ａ−２のシャルピーは衝撃値は■が添
加されている比較例Ｂ−２比較例Ｃ−Ｌ、比較例（、−
２より高いことを示すが■が添加されていないため窒化
による硬化深さが浅いのは前記と同様である。FIG. 4 shows Comparative Example A-2 and Comparative Example B-2. This is a comparison of the Charpy impact values of Comparative Example C1 and Comparative Example C-2, and the Charpy of Comparative Example A-2 in which V is not added has an impact value of Comparative Example B-2 in which ■ is added.Comparative Example C-L , Comparative example (, -
Although it shows that the value is higher than 2, the hardening depth due to nitriding is shallow because ▪ is not added, as described above.
（発明の効果）
本発明の特許請求の範囲（１）のものによれば従来技術
のものに比べて、優れた靭性を得ることができる。(Effects of the Invention) According to the invention set forth in claim (1), superior toughness can be obtained compared to those of the prior art.
特許請求の範囲（２）のものによれば特許請求の範囲（
１）のものより更に優れた靭性を得ることができる。According to claim (2), the claim (
Even better toughness than 1) can be obtained.
第１図はシャルピー衝撃試験片の硬さ分布、第２図は比
較例Ｂ−１と実施例１．実施例２のシャルピー衝撃値の
比較グラフ。
第３図は比較例Ａ−１と比較例Ｂ−１のシャルピー衝撃
値の比較グラフ、第４図は比較例Ａ−２と比較例Ｂ−２
，Ｃ−１，（、−２のシャルピー衝撃値の比較グラフを
それぞれ示す図である。Fig. 1 shows the hardness distribution of the Charpy impact test specimens, and Fig. 2 shows the hardness distribution of the Charpy impact test pieces. A comparison graph of Charpy impact values of Example 2. Figure 3 is a comparison graph of Charpy impact values of Comparative Example A-1 and Comparative Example B-1, and Figure 4 is a graph of Comparative Example A-2 and Comparative Example B-2.
, C-1, (, -2) are graphs showing a comparison of Charpy impact values.
Claims (2)
００℃で加熱後急冷することを特徴とする窒化部品の製
造方法。 Ｃ：０．２０〜０．５０％ Ｓｉ：０．３０％以下 Ｍｎ：０．５０〜１．５０％ Ｃｒ：１．２０％以下 Ｖ：０．０５〜０．３０％ Ａｌ：０．０５〜０．３０％ Ｐ、Ｓ：それぞれ０．０２％以下 Ｃｕ、Ｎｉ、Ｓｎ：それぞれ０．０５％以下残部：Ｆｅ
とその他不可避不純物(1) Have the following composition as an essential component, and 800 to 9
A method for manufacturing nitrided parts, characterized by heating at 00°C and then rapidly cooling. C: 0.20~0.50% Si: 0.30% or less Mn: 0.50~1.50% Cr: 1.20% or less V: 0.05~0.30% Al: 0.05~ 0.30% P, S: 0.02% or less each Cu, Ni, Sn: 0.05% or less each Balance: Fe
and other unavoidable impurities
１項記載の迅速窒化鋼の製造方法。(2) The method for producing rapid nitriding steel according to claim 1, wherein the essential components further include Mo: 0.10 to 0.40%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18727488A JPH0270056A (en) | 1988-07-26 | 1988-07-26 | Production of nitrided parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18727488A JPH0270056A (en) | 1988-07-26 | 1988-07-26 | Production of nitrided parts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0270056A true JPH0270056A (en) | 1990-03-08 |
Family
ID=16203126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18727488A Pending JPH0270056A (en) | 1988-07-26 | 1988-07-26 | Production of nitrided parts |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0270056A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2811079A1 (en) | 2013-06-03 | 2014-12-10 | Kobelco Construction Machinery Co., Ltd. | Construction machine |
-
1988
- 1988-07-26 JP JP18727488A patent/JPH0270056A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2811079A1 (en) | 2013-06-03 | 2014-12-10 | Kobelco Construction Machinery Co., Ltd. | Construction machine |
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